Which one of the following terms is used to refer to the specialized endoplasmic reticulum of muscle cells?

Question

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The specialized endoplasmic reticulum in muscle cells is known as the sarcoplasmic reticulum. It plays a crucial role in calcium ion storage and release during muscle contraction. Myofibrils are contractile fibers, sarcomere is the basic unit of muscle contraction, sarcoplasm is the cytoplasm of muscle cells, and sarcolemma is the plasma membrane of muscle cells.

Which One of the Following Terms Is Used to Refer